(19)
(11) EP 3 055 502 A1

(12)

(43) Date of publication:
17.08.2016 Bulletin 2016/33

(21) Application number: 14852473.9

(22) Date of filing: 06.10.2014
(51) International Patent Classification (IPC): 
E21B 47/04(2012.01)
E21B 47/09(2012.01)
(86) International application number:
PCT/US2014/059306
(87) International publication number:
WO 2015/054131 (16.04.2015 Gazette 2015/15)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 09.10.2013 US 201314049430

(71) Applicant: Baker Hughes Incorporated
Houston, TX 77210-4740 (US)

(72) Inventors:
  • KRUSPE, Thomas
    29649 Wietzendorf (DE)
  • ESTES, Robert A.
    Tomball, TX 77377-8484 (US)
  • DIFOGGIO, Rocco
    Houston, TX 77272-0734 (US)
  • HANAK, Francis Chad
    League City, TX 77573 (US)

(74) Representative: Lambacher, Michael et al
Euromarkpat V. Füner Ebbinghaus Finck Hano Mariahilfplatz 3
81541 München
81541 München (DE)

   


(54) DOWNHOLE CLOSED LOOP DRILLING SYSTEM WITH DEPTH MEASUREMENT